Add dockerfile linting

.github/workflows/main.yml

@@ -12,6 +12,12 @@ jobs:
       - name: Check out Git repository
         uses: actions/checkout@v2
 
+      - name: Lint Dockerfile
+        uses: hadolint/hadolint-action@master
+        with:
+          recursive: true
+          dockerfile: "Dockerfile"
+
       - uses: pmorelli92/[email protected]
         name: Build and Publish arc:latest
         with: